1012202020021 has 4 divisors (see below), whose sum is σ = 1012764044044. Its totient is φ = 1011639996000.

The previous prime is 1012202020001. The next prime is 1012202020033. The reversal of 1012202020021 is 1200202022101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 526691290225 + 485510729796 = 725735^2 + 696786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012202020021 - 2⁹ = 1012202019509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012202019983 and 1012202020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012202020001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281009310 + ... + 281012911.

It is an arithmetic number, because the mean of its divisors is an integer number (253191011011).

Almost surely, 2^{1012202020021} is an apocalyptic number.

It is an amenable number.

1012202020021 is a deficient number, since it is larger than the sum of its proper divisors (562024023).

1012202020021 is an equidigital number, since it uses as much as digits as its factorization.

1012202020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562024022.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1012202020021 its reverse (1200202022101), we get a palindrome (2212404042122).

The spelling of 1012202020021 in words is "one trillion, twelve billion, two hundred two million, twenty thousand, twenty-one".